sub·stance noun \ˈsəb-stən(t)s\
: physical material from which something is made or which has discrete existence <the substance of nerve tissue>
: matter of particular or definite chemical constitution
: something (as alcohol, methamphetamine, or marijuana) deemed harmful and usually subject to legal restriction <heroin is a controlled substance> <substance abuse>
Seen & Heard
What made you want to look up substance? Please tell us where you read or heard it (including the quote, if possible).